Troubleshooting by Remote Controller
SiUS281117
Service Diagnosis
127
2.19 Suction Air Thermistor Abnormality
Remote
Controller
Display
C9
Applicable
Models
FCQ, FHQ, FAQ, FBQ
Method of Error
Detection
The error is detected by temperature detected by suction air thermistor.
Error Decision
Conditions
When the suction air thermistor becomes disconnected or shorted while the unit is running
Supposed
Causes
Defective indoor unit thermistor for suction air
Defective indoor unit PCB
Troubleshooting
Note:
Connector and indoor unit PCB
Connector is
connected to the
connector(
∗
) of the indoor
unit PCB.
Resistance
is normal when
measured after
disconnecting the thermistor
from the indoor unit
PCB.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
CHECK 5
Replace the indoor unit PCB.
Connect the thermistor and turn
ON again.
NO
NO
Replace the thermistor (
∗
).
YES
YES
Model
Connector for the suction air thermistor
Symbol
PCB
FCQ
X16A
R1T
A2P
FHQ
X13A
R1T
A1P
FAQ
X19A
R1T
A1P
FBQ
X16A
R1T
A1P
CHECK 5